19th Century European Walnut Gondola Style Armchair. 
 
The chair features a ladder back, down-scrolled arms, and an X frame cross stretcher on 4 paw feet. This specific silhouette is often associated with "Gondola" or "Renaissance Revival" styles.  The 3 shaped ladder back is topped with turned finials.  The chair has a stuff over saddle seat upholstered in fine brown leather augmented with studding.  
Richly patinated mid-19th century example is in good/very good condition.  Reattachment of one finial is noticed.
 
Measurements: H 35” x W 21.5” x D 17
Seat H 18”, Arm H 27”
Interior W 15” x D 15”